eW/WE/
The water environment
Climate: Fog, Frost & Humidity
AB6
Because of the altitude and the 'continental' influence there is a
large daily and seasonal range of temperatures so that frost is a
frequent occurrence in winter. Frost occurs at high altitudes during
cold, clear winter nights, where air is driest over the western
interior and plateau. The frost season is longest (from April to
October) over the eastern and southern plateau areas bordering on
the Escarpment. Frost decreases to the north, while the coast is
virtually frost-free.
The only area that commonly experiences
fog is the ‘mist belt’ along the eastern
foothills of the escarpment. The northwest coast is virtually rain-free, yet fog is
frequent.
Low stratus clouds and fog
frequent over the cool west coast,
particularly in summer.
The average annual humidity readings indicate that the air is driest
over the western interior and the plateau. Coastal humidity is
much higher and occasionally may rise to 85%. During summer,
low stratus clouds and fog frequently occur over the cool west
coast.
Contact: ewisa@wamsys.co.za URL: www.waterinfo.co.za
Prepared by: eWISA
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